A method for burning secondary sludge in a recovery boiler

Details A method for burning secondary sludge in a recovery boiler A method for burning secondary sludge in a recovery boiler

D - Textiles, Paper

21

C

D21C 11/12 (2006.01) C02F 11/06 (2006.01) D21C 11/00 (2006.01) F23G 7/04 (2006.01)

Patent

CA 2174447

A method for burning secondary sludge in a recovery boiler, in which method secondary sludge is mixed with black liquor. According to the method, an alkali is added to the secondary sludge so as to obtain a mixture having a pH of over 7, whereafter the mixture of alkali and secondary sludge is heated to a temperature of over 80°C and kept at this temperature for over 30 minutes. Thereafter, the heat-treated mixture of alkali and secondary sludge is supplied to the thick end of a black liquor evaporation plant.

Procédé permettant de brûler des boues secondaires dans une chaudière de récupération, selon lequel lesdites boues secondaires sont mélangées avec de la liqueur noire. Selon ledit procédé, un alcali est ajouté aux boues secondaires de manière à obtenir un mélange ayant un pH supérieur à 7, après quoi ledit mélange d'alcali et de boues secondaires est chauffé à une température supérieure à 80~C et maintenu à cette température pendant plus de 30 minutes. Ensuite, ledit mélange traité thermiquement d'alcali et de boues secondaires est acheminé vers l'extrémité d'épaississement d'une installation d'évaporation de liqueur noire.

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